Tension regulating device for spinning frames



April 3, 1962 R. K. LOBDELL 3,028,118

TENSION REGULATING DEVICE FOR SPINNING FRAMES Filed April 8, 1959 iNVENTOR. 15 1 I 1 The present invention relates to a tension regulating device for spinning frames, and more particularly to a device for automatically maintaining a substantially constant tension on a yarn or roving being unreeled, and for quickly arresting the rotation of the bobbin in case the bobbin should overrun.

The present invention is an improvement over the structure shown in the patent to Mann 2,109,543 issued March 1, 193 8, and the application of Kucmerosky Serial No. 795,680, filed February 26, 1959, now Patent No. 2,973,920, assigned to the assignee of the present application.

As set forth in the patent to Mann, in creeling operations involving wound packaged yarn or roving suspended on anti-friction bearings, it is desirable to maintain as low tension on the yarn as practical in order to permit the use of low twist and long draft. This makes it necessary to maintain the tension as uniform as possible in order to avoid breakage by too much tension, or overrun by too low tension, and the Mann bar brake was a long step in this direction as evidenced by its wide commercial adoption.

It is an object of the present invention to further improve the operation of the Mann bar brake by incorporating therein an automatic tension controlling means.

It is another object to provide such a device which operates in case of overrunning of the bobbin to quickly arrest the rotation of the bobbin.

It is another object to provide a bar brake for spinning frames which bears frictionally on the surface of the yarn package with a pressure which is automatically adjusted to maintain the desired tension on the yarn.

Further objects and advantages will be apparent from the following description taken in connection with the accompanying drawing in which:

FIG. 1 is a side elevational view, partly broken away and in section, of a bobbin holder and bar brake structure constituting a preferred embodiment of the invention;

FIG. 2 is a cross section view taken substantially on the plane of line 2--2 of FIG. 1, and

FIG. 3 is a detail view of the bar brake.

In FIG. 1 of the drawing there is illustrated a creel support member 1 of a spinning frame in the form of a channel bar which is formed with a flat under surface slotted as indicated at 2 for the reception of a series of bobbin holders, one of which is indicated generally by the numeral 3.

The bobbin holder comprises a supporting bolt 4 which cooperates with a nut 5 within the creel bar 1 to clamp a mounting member and dust cap 6 against the bottom of the creel bar.

The bolt 4 is connected by a universal swivel bearing 7 to the body 8 of the bobbin holder. A bobbin 9 is detachably mounted on the holder and carries a wound package of yarn 11 to be unreeled therefrom in the spinning operation.

The mounting member 6 is formed with laterally extending cars 12 which are drilled horizontally as indicated at 13 for the reception of the angularly bent end 14 of a bar brake member 15. The bar brake is thus hinged to the mounting member for movement toward and away from the axis of the bobbin holder.

The bar brake member extends downwardly and laterally from its hinged connection with the mounting member, and adjacent its lower end is formed with an approximately horizontally bent portion 16 adapted to bear on the periphery of the yarn package 11. The brake member terminates in a loop 17, which is open at one side as indicated at 18 in FIG. 2, the passage through the loop being approximately radial to the yarn package and so arranged in relation to the direction of rotation of the yarn package that the closed side 19 of the loop engages the yarn as it leaves the package and forms a guide therefor. Preferably, the mounting member 6 is so oriented in the spinning frame that the yarn leaves the guide loop of the bar brake in a substantially radial direction as shown in FIG. 2.

In the operation of this device when a bobbin 9 with its yarn package 11 is mounted on the bobbin holder 3, the yarn is passed through the opening 18 into the loop 17 of the bar brake and conducted to a receiving spool or bobbin in the usual manner. The weight of the bar brake with its terminal loop 17 is greater than the conventional brake member, so that the contact of the part 16 of the brake with the yarn package provides more than the usual retarding elfect. Since, however, the radial component of the tension on the yarn tends to raise the loop 17 of the bar brake away from the yarn package, the retarding effect of the brake is relieved by a function of the yarn tension. The tension of the yarn is thus automatically stabilized, and maintained substantially constant irrespective of any irregularities in the resistance to rotation of the yarn package caused by vibration, the effect of lint blowers, or any other cause.

Although but one form of the invention has been shown and described in detail, it will be understood that changes may be made in the form and arrangement of the parts without departing from the spirit of the invention.

I claim:

1. In a spinning frame: a creel member; a bobbin holder including a mounting member pendulously and rotatably mounted on the creel member; a bobbin and cop of yarn supported on the holder for unwinding; a bar brake pivotally supported by the mounting member for vertical swinging movement towards and away from the axis of the bobbin and formed to bear frictionally adjacent its lower extremity on the surface of the cop for retarding bobbin rotation; guide means for the unwinding yarn on the lower extremity of the brake offset from the frictional bearing portion thereof, said guide means comprising a substantially circular loop having a slot-like opening therein for lateral reception of the unwinding yarn and a closed portion arranged to engage the unwinding yarn as it leaves the bobbin.

2. A device as set forth in claim 1 in which the guide means circular loop opens radially relative to the bobbin and cop whereby the components of tension exerted by the unwinding yarn against the closed portion of said loop are utilized to swing the bar brake away from the cop surface to diminish bobbin braking.

3. A device as set forth in claim 1 in which the bar brake is so oriented that, when the yarn leaves the guide means, it travels substantially radially with respect to the axis of the bobbin and cop.

References Cited in the file of this patent UNITED STATES PATENTS 902,247 Nichols Oct. 27, 1908 2,536,931 Harward Jan. 2, 1951 2,798,681 Beverino July 9, 1957 

